[clang-format] Fix a bug that doesn't break braces before unions for Allman

Differential Revision: https://reviews.llvm.org/D65631

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@367648 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/Format.cpp

@@ -640,6 +640,7 @@ static FormatStyle expandPresets(const FormatStyle &Style) {
     Expanded.BraceWrapping.AfterNamespace = true;
     Expanded.BraceWrapping.AfterObjCDeclaration = true;
     Expanded.BraceWrapping.AfterStruct = true;
+    Expanded.BraceWrapping.AfterUnion = true;
     Expanded.BraceWrapping.AfterExternBlock = true;
     Expanded.BraceWrapping.BeforeCatch = true;
     Expanded.BraceWrapping.BeforeElse = true;

unittests/Format/FormatTest.cpp

@@ -11086,6 +11086,9 @@ TEST_F(FormatTest, AllmanBraceBreaking) {
                "{\n"
                "  int x;\n"
                "};\n"
+               "union C\n"
+               "{\n"
+               "};\n"
                "} // namespace a",
                AllmanBraceStyle);